[ARC5] Transistorized ARC-5 Receiver

[AKLDGUY .]

I successfully converted the RF and IF amplifier stages of an ARC-5
receiver to FETs,
using the commonly available MPF-102. I simply soldered the gate, source,
and drain
leads to the grid, cathode, and plate terminals respectively on the tube
sockets.

Hardly any retuning was necessary, because the rather long wiring leads to
the socket
terminals mostly determine the capacitance, rather than the internal
capacitances of
the devices.

Changed the cathode resistors to 270 ohm, a typical source resistor
value used in
ARRL Handbook circuits of the time.

73 de Neil ZL1ANM


On Mon, Jan 2, 2017 at 6:26 AM, MICHAEL ST ANGELO <mstangelo at comcast.net>
wrote:

> Actually it is a good way to resurrect a gutted receive or a set missing
> tubes. Since you have to replace the capacitors you may explore the solid
> state option.
>
> I am a longtime LF listener. In the 1970's I was looking for a battery
> powered receiver to listen to the LF band. I rebuilt a BC-453 with solid
> state devices.
>
> I used JFETS's in the RF, oscillator and BFO stages and Dual Gate MOSFET's
> in the mixer and IF stages. I forgot what I used in the detector and audio
> stages. It was an excellent receiver with very low power consumption. I
> operated it form 12 volts.
>
> I was going to built solid state converters for the ham bands but college,
> employment got in the way.
>
> I referenced an article in QST or Ham Radio about a solid state conversion
> in a BC-348 for my design. If I find the article I will post the
> information.
>
> JFETS are still available but it may be difficult to find Dual Gate
> MOSFETS. I believe some Dual GAte devices are available in SMT packages.
>
> Happy New Year,
>
> Mike N2MS
>
> > On December 31, 2016 at 8:50 PM Phillip Carpenter <carpenterpa at tds.net>
> wrote:
> >
> >
> > I just want to read the article...
> >
> > Phillip
> >
> > Sent from my iPhone
> >
> > > On Dec 31, 2016, at 8:22 PM, Bob Moody <bob at vanirmail.com> wrote:
> > >
> > > Isn't that like putting a smog pump on a Model A?
> > >
> > > K7IRK
> > >
> > >
> > >
> > > ----- Original Message ----- From: "Phillip Carpenter" <
> carpenterpa at tds.net>
> > > To: <arc5 at mailman.qth.net>
> > > Sent: Saturday, December 31, 2016 3:48 PM
> > > Subject: [ARC5] Transistorized ARC-5 Receiver
> > >
> > >
> > >> Does anyone on the Forum know the correct citation for an article
> that describes how to transistorize the Command BC-45x series receivers?
> > >>
> > >> It is thought that the article appeared in Short Wave or RadCom
> magazines or perhaps one of the other radio journals back in the late 1960s
> or 1970s.
> > >>
> > >> Thank you in advance to all who reply!
> > >>
> > >> Respectfully,
> > >>
> > >> Phillip W4RTX
> > >>
> > >> Sent from my iPhone
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